/*
 * QR Maker — dark theme only.
 * Concept: a scanner viewfinder floating over an aurora and a module grid.
 * Every text/control colour pair is checked against WCAG 2.2 AA (see ARCHITECTURE.md).
 */

:root {
  color-scheme: dark;

  --page: #07080c;
  --panel: rgb(16 18 26 / 0.9);
  --panel-solid: #10121a;
  --card: #151823;
  --field: #0a0c12;

  --text: #f1f3f9;
  --muted: #9ba4b8;
  --subtle: #8a93a8;
  --border: #646d84;
  --hairline: rgb(255 255 255 / 0.08);

  --cyan: #5ee7ff;
  --violet: #b49cff;
  --on-accent: #06070b;
  --error: #ff8f8f;
  --warn: #ffd166;
  --focus: #5ee7ff;

  --gradient: linear-gradient(120deg, var(--cyan), var(--violet));
  --radius-lg: 22px;
  --radius: 14px;
  --radius-sm: 10px;
  --gap: 16px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  --font: "Inter", "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  --mono: "JetBrains Mono", "Cascadia Code", ui-monospace, Consolas, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(rgb(255 255 255 / 0.055) 1px, transparent 1.2px) 0 0 / 22px 22px,
    var(--page);
  color: var(--text);
  font: 16px/1.55 var(--font);
  font-feature-settings: "cv11", "ss01";
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

svg {
  flex: none;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

::selection {
  background: rgb(94 231 255 / 0.3);
}

/* ---------- Ambient background ---------- */

.aurora {
  position: fixed;
  inset: -20vmax;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(40vmax 30vmax at 20% 15%, rgb(94 231 255 / 0.16), transparent 70%),
    radial-gradient(45vmax 35vmax at 85% 10%, rgb(180 156 255 / 0.18), transparent 70%),
    radial-gradient(40vmax 30vmax at 60% 95%, rgb(94 231 255 / 0.07), transparent 70%);
  filter: blur(20px);
}

/* ---------- Header ---------- */

.site-header,
.layout,
.site-footer {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: var(--gap);
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  padding-block: 14px 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  align-self: center;
}

.brand h1 {
  font-size: 1.25rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand-mark {
  width: 26px;
  height: 26px;
  padding: 3px;
  border-radius: 7px;
  color: var(--page);
  background: var(--gradient);
  box-shadow: 0 0 20px rgb(94 231 255 / 0.35);
}

.brand-mark path:nth-child(2) {
  fill: transparent;
}

.tagline {
  color: var(--muted);
  font-size: 0.875rem;
}

.noscript {
  max-width: 1120px;
  margin: 0 auto var(--gap);
  padding: 12px var(--gap);
  color: var(--warn);
}

/* ---------- Layout and panels ---------- */

.layout {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
  align-items: start;
}

@media (min-width: 880px) {
  .layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 18px;
  }
}

.panel {
  display: grid;
  gap: 18px;
  min-width: 0;
  padding: clamp(14px, 2vw, 20px);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    linear-gradient(150deg, rgb(94 231 255 / 0.35), rgb(255 255 255 / 0.06) 35%, rgb(255 255 255 / 0.04) 65%, rgb(180 156 255 / 0.35)) border-box;
  box-shadow:
    0 1px 0 rgb(255 255 255 / 0.05) inset,
    0 30px 80px -30px rgb(0 0 0 / 0.8);
}

.site-footer {
  padding-block: 10px 12px;
  color: var(--subtle);
  font-size: 0.75rem;
  text-align: center;
}

/* ---------- Steps ---------- */

.step {
  display: grid;
  gap: 8px;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.step-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0;
  margin-bottom: 2px;
  font-weight: 650;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.step-num {
  display: inline-grid;
  place-items: center;
  min-width: 30px;
  height: 22px;
  padding-inline: 6px;
  border-radius: 6px;
  background: rgb(94 231 255 / 0.1);
  color: var(--cyan);
  font: 600 0.72rem/1 var(--mono);
  letter-spacing: 0.04em;
}

.step-foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 16px;
}

.help,
.counter {
  color: var(--subtle);
  font-size: 0.8125rem;
}

.counter {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- Inputs ---------- */

.input-shell {
  position: relative;
  border-radius: var(--radius);
  padding: 1px;
  background: var(--border);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.input-shell:focus-within {
  background: var(--gradient);
  box-shadow: 0 0 0 4px rgb(94 231 255 / 0.12), 0 0 40px -8px rgb(94 231 255 / 0.45);
}

.input-shell:has(textarea[aria-invalid="true"]) {
  background: var(--error);
}

textarea,
input[type="text"],
select {
  width: 100%;
  min-height: 44px;
  background: var(--field);
  color: var(--text);
  font: inherit;
}

textarea {
  display: block;
  min-height: 84px;
  padding: 12px 14px;
  border: 0;
  border-radius: calc(var(--radius) - 1px);
  resize: vertical;
  font-family: var(--mono);
  font-size: 0.95rem;
  line-height: 1.6;
}

textarea:focus-visible {
  outline: none;
}

textarea::placeholder {
  color: var(--subtle);
}

input[type="text"],
select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

input[type="text"]:focus-visible,
select:focus-visible {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgb(94 231 255 / 0.25);
}

input[aria-invalid="true"] {
  border-color: var(--error);
}

/* ---------- Colours ---------- */

.colors {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.color-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--card);
  transition: border-color 0.2s var(--ease);
}

.color-card:focus-within {
  border-color: rgb(94 231 255 / 0.5);
}

.color-text {
  display: grid;
  gap: 2px;
  min-width: 0;
  flex: 1;
}

.color-text label {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.color-text .hex {
  min-height: 36px;
  padding: 4px 8px;
  font-family: var(--mono);
  font-size: 0.9rem;
  text-transform: lowercase;
}

input[type="color"] {
  appearance: none;
  -webkit-appearance: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: none;
  cursor: pointer;
  transition: transform 0.2s var(--ease);
}

input[type="color"]:hover {
  transform: scale(1.05);
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 3px;
}

input[type="color"]::-webkit-color-swatch {
  border: 0;
  border-radius: 8px;
}

/* ---------- Style options and Advanced ---------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.colors-step {
  position: relative;
}

.reset {
  position: absolute;
  top: -4px;
  right: 0;
}

.option-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 12px;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.option-row legend {
  float: left;
  width: 3.5rem;
  padding: 0;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pills,
.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-width: 0;
}

.pill,
.segment {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 36px;
  min-width: 36px;
  padding: 6px 12px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: var(--card);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 550;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.pill input,
.segment input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.pill:hover,
.segment:hover {
  border-color: var(--border);
  color: var(--text);
}

.pill:has(input:checked),
.segment:has(input:checked) {
  border-color: rgb(94 231 255 / 0.65);
  background: linear-gradient(120deg, rgb(94 231 255 / 0.14), rgb(180 156 255 / 0.12)), var(--card);
  color: var(--text);
}

.pill:has(input:focus-visible),
.segment:has(input:focus-visible) {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.pill svg {
  width: 18px;
  height: 18px;
}

.pill-icon,
.pill-upload {
  padding-inline: 8px;
}

.pill-upload img {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  object-fit: contain;
  background: #fff;
}

.pill-upload img:not([hidden]) + svg {
  display: none;
}

.shape-swatch {
  width: 14px;
  height: 14px;
  background: currentColor;
}

.shape-rounded {
  border-radius: 4px;
}

.shape-dots {
  border-radius: 50%;
}

.segmented {
  gap: 0;
  padding: 3px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: var(--field);
}

.segment {
  min-height: 32px;
  padding: 4px 12px;
  border-color: transparent;
  background: transparent;
}

.segment small {
  color: var(--subtle);
  font: 0.7rem var(--mono);
}

.segment:has(input:disabled) {
  opacity: 0.45;
  cursor: not-allowed;
}

.segment:has(input:disabled) input {
  cursor: not-allowed;
}

.advanced summary {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 36px;
  font-weight: 650;
  font-size: 0.95rem;
  cursor: pointer;
  list-style: none;
}

.advanced summary::-webkit-details-marker {
  display: none;
}

.advanced[open] summary {
  margin-bottom: 4px;
}

.chevron {
  width: 9px;
  height: 9px;
  margin-left: auto;
  margin-right: 6px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg) translateY(-2px);
  transition: transform 0.25s var(--ease);
}

.advanced[open] .chevron {
  transform: rotate(225deg) translate(-2px, 0);
}

/* ---------- Buttons ---------- */

.button,
.button-icon,
.button-link {
  font: inherit;
  cursor: pointer;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 650;
  letter-spacing: -0.005em;
  transition: transform 0.15s var(--ease), box-shadow 0.25s var(--ease), filter 0.2s;
}

.button svg {
  width: 18px;
  height: 18px;
}

.button:active:not(:disabled) {
  transform: translateY(1px) scale(0.99);
}

.button-primary {
  background: var(--gradient);
  color: var(--on-accent);
  box-shadow: 0 10px 30px -10px rgb(94 231 255 / 0.6);
}

.button-primary:hover:not(:disabled) {
  filter: brightness(1.08) saturate(1.1);
  box-shadow: 0 14px 40px -10px rgb(180 156 255 / 0.7);
}

.button-ghost {
  background:
    linear-gradient(var(--panel-solid), var(--panel-solid)) padding-box,
    var(--gradient) border-box;
  color: var(--text);
}

.button-ghost:hover:not(:disabled) {
  background:
    linear-gradient(rgb(94 231 255 / 0.08), rgb(180 156 255 / 0.08)) padding-box,
    var(--gradient) border-box;
}

.button:disabled {
  background: rgb(255 255 255 / 0.04);
  border-color: var(--hairline);
  color: var(--subtle);
  box-shadow: none;
  cursor: not-allowed;
}

.button-small {
  min-height: 40px;
  padding: 6px 14px;
  background: var(--gradient);
  color: var(--on-accent);
  font-size: 0.875rem;
}

.button-icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  font-size: 1.25rem;
  line-height: 1;
}

.button-link {
  justify-self: start;
  min-height: 32px;
  padding: 4px 0;
  border: 0;
  background: none;
  color: var(--muted);
  font-size: 0.875rem;
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 4px;
}

.button-link:hover {
  color: var(--text);
  text-decoration-color: var(--cyan);
}

/* ---------- Hint and messages ---------- */

.hint {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 10px 12px;
  padding: 14px 16px;
  border: 1px solid rgb(94 231 255 / 0.35);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgb(94 231 255 / 0.08), rgb(180 156 255 / 0.06));
  font-size: 0.9rem;
  animation: rise 0.35s var(--ease);
}

.hint[hidden] {
  display: none;
}

.hint-icon {
  width: 20px;
  height: 20px;
  margin-top: 2px;
  color: var(--cyan);
}

.hint-actions {
  grid-column: 2;
  display: flex;
  gap: 8px;
}

.messages {
  display: grid;
  gap: 8px;
}

.messages:empty {
  display: none;
}

.message {
  display: flex;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  animation: rise 0.3s var(--ease);
}

.message::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 10px currentColor;
}

.message-error {
  color: var(--error);
  background: rgb(255 143 143 / 0.08);
  border: 1px solid rgb(255 143 143 / 0.3);
}

.message-info {
  color: var(--muted);
  background: rgb(94 231 255 / 0.06);
  border: 1px solid rgb(94 231 255 / 0.2);
}

.message-info::before {
  background: var(--cyan);
  color: var(--cyan);
}

.message-warning {
  color: var(--warn);
  background: rgb(255 209 102 / 0.07);
  border: 1px solid rgb(255 209 102 / 0.25);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
}

/* ---------- Viewfinder preview ---------- */

.viewfinder {
  --corner: var(--cyan);
  position: relative;
  width: min(100%, 420px, max(240px, 100dvh - 262px));
  margin-inline: auto;
  padding: 14px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(var(--corner), var(--corner)) top left / 34px 3px,
    linear-gradient(var(--corner), var(--corner)) top left / 3px 34px,
    linear-gradient(var(--violet), var(--violet)) top right / 34px 3px,
    linear-gradient(var(--violet), var(--violet)) top right / 3px 34px,
    linear-gradient(var(--corner), var(--corner)) bottom left / 34px 3px,
    linear-gradient(var(--corner), var(--corner)) bottom left / 3px 34px,
    linear-gradient(var(--violet), var(--violet)) bottom right / 34px 3px,
    linear-gradient(var(--violet), var(--violet)) bottom right / 3px 34px;
  background-repeat: no-repeat;
  overflow: hidden;
}

.viewfinder.has-code::before {
  content: "";
  position: absolute;
  inset: 22%;
  z-index: -1;
  border-radius: 50%;
  background: var(--gradient);
  filter: blur(60px);
  opacity: 0.35;
}

.preview {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  width: 100%;
  border-radius: var(--radius);
  background:
    repeating-linear-gradient(45deg, rgb(255 255 255 / 0.025) 0 10px, transparent 10px 20px),
    var(--card);
  border: 1px dashed var(--border);
  overflow: hidden;
}

.viewfinder.has-code .preview {
  border: 0;
  background: none;
  box-shadow: 0 20px 60px -20px rgb(0 0 0 / 0.9);
}

.preview .code {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: var(--radius);
  animation: materialize 0.45s var(--ease);
  transition: opacity 0.3s, filter 0.3s;
}

@keyframes materialize {
  from {
    opacity: 0;
    transform: scale(0.97);
    filter: blur(6px);
  }
}

.preview.is-stale .code {
  opacity: 0.22;
  filter: grayscale(1) blur(1px);
  animation: none;
}

.placeholder {
  max-width: 22ch;
  padding: 24px;
  color: var(--muted);
  text-align: center;
}

.scanline {
  position: absolute;
  left: 14px;
  right: 14px;
  top: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient);
  box-shadow: 0 0 18px 3px rgb(94 231 255 / 0.55);
  opacity: 0;
  pointer-events: none;
}

.viewfinder.is-scanning .scanline {
  opacity: 1;
  animation: scan 1s var(--ease) infinite alternate;
}

@keyframes scan {
  to {
    top: calc(100% - 16px);
  }
}

.status-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  min-height: 18px;
  margin-top: -10px;
}

.meta {
  color: var(--subtle);
  font: 0.78rem/1.4 var(--mono);
  letter-spacing: 0.02em;
}

.meta:empty {
  display: none;
}

.updating {
  color: var(--cyan);
  font: 0.78rem/1.4 var(--mono);
}

/* ---------- Export ---------- */

.export {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 8px;
  padding-top: 14px;
  border-top: 1px solid var(--hairline);
}

.export .button {
  min-height: 40px;
  padding: 6px 16px;
  font-size: 0.9rem;
}

.select-shell {
  position: relative;
}

.select-shell::after {
  content: "";
  position: absolute;
  right: 14px;
  top: 50%;
  width: 7px;
  height: 7px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

select {
  appearance: none;
  -webkit-appearance: none;
  min-height: 40px;
  padding-inline: 12px 34px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.85rem;
  cursor: pointer;
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .viewfinder.is-scanning .scanline {
    top: 50%;
  }
}